beams

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Q 
What is an RSJ ?
A 
An RSJ is a rolled steel joist.  These are 'I' section steel 
beams.  Most 'I' section beams which are used in construction 
theses days are not actually RSJ's but UB's or UC's (Universal 
Beams and Columns). These have parallel flanges rather than 
the tapered flanges of RSJ's and therefore they are slightly 
more efficient sections. Although UC's are primarily designed 
for use as columns, they do make very efficient sections for 
beams with longer spans (typically over 4m) because of their 
increased resistance to lateral torsional buckling.

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